题目内容
(2012?顺昌县)脱式计算.(能简算的要简算)
①14×75-624÷39
②
÷9+
×
③
+(
-
)÷
④
÷[
-(1-
)].
①14×75-624÷39
②
5 |
7 |
4 |
7 |
1 |
9 |
③
2 |
3 |
5 |
6 |
3 |
4 |
3 |
8 |
④
7 |
11 |
2 |
5 |
7 |
10 |
分析:①③④根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
②可根据乘法分配律计算.
②可根据乘法分配律计算.
解答:解:①14×75-624÷39
=1050-16,
=1034;
②
÷9+
×
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
③
+(
-
)÷
=
+
×
,
=
+
,
=
;
④
÷[
-(1-
)].
=
÷[
-
],
=
÷
,
=
.
=1050-16,
=1034;
②
5 |
7 |
4 |
7 |
1 |
9 |
=
5 |
7 |
1 |
9 |
4 |
7 |
1 |
9 |
=(
5 |
7 |
4 |
7 |
1 |
9 |
=
9 |
7 |
1 |
9 |
=
1 |
7 |
③
2 |
3 |
5 |
6 |
3 |
4 |
3 |
8 |
=
2 |
3 |
1 |
12 |
8 |
3 |
=
2 |
3 |
2 |
9 |
=
8 |
9 |
④
7 |
11 |
2 |
5 |
7 |
10 |
=
7 |
11 |
2 |
5 |
3 |
10 |
=
7 |
11 |
1 |
10 |
=
70 |
11 |
点评:完成脱式计算时,要注意计算过程的完整性,中间不要有太大跳跃.
练习册系列答案
相关题目